content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable;
  
  import java.util.concurrent.ConcurrentLinkedQueue;
  import java.util.concurrent.atomic.*;
  
  import org.junit.*;
  import org.reactivestreams.*;
  
  import io.reactivex.common.Schedulers;
  import io.reactivex.common.functions.*;
  import io.reactivex.common.internal.utils.ExceptionHelper;
  import io.reactivex.flowable.internal.operators.*;
  import io.reactivex.flowable.subscribers.DefaultSubscriber;
  
  public class FlowableConversionTest {
  
      public static class Cylon { }
  
      public static class Jail {
          Object cylon;
  
          Jail(Object cylon) {
              this.cylon = cylon;
          }
      }
  
      public static class CylonDetectorObservable<T> {
          protected Publisher<T> onSubscribe;
  
          public static <T> CylonDetectorObservable<T> create(Publisher<T> onSubscribe) {
              return new CylonDetectorObservable<T>(onSubscribe);
          }
  
          protected CylonDetectorObservable(Publisher<T> onSubscribe) {
              this.onSubscribe = onSubscribe;
          }
  
          public void subscribe(Subscriber<T> subscriber) {
              onSubscribe.subscribe(subscriber);
          }
  
          public <R> CylonDetectorObservable<R> lift(FlowableOperator<? extends R, ? super T> operator) {
              return x(new RobotConversionFunc<T, R>(operator));
          }
  
          public <R, O> O x(Function<Publisher<T>, O> operator) {
              try {
                  return operator.apply(onSubscribe);
              } catch (Throwable ex) {
                  throw ExceptionHelper.wrapOrThrow(ex);
              }
          }
  
          public <R> CylonDetectorObservable<? extends R> compose(Function<CylonDetectorObservable<? super T>, CylonDetectorObservable<? extends R>> transformer) {
              try {
                  return transformer.apply(this);
              } catch (Throwable ex) {
                  throw ExceptionHelper.wrapOrThrow(ex);
              }
          }
  
          public final CylonDetectorObservable<T> beep(Predicate<? super T> predicate) {
              return new CylonDetectorObservable<T>(new FlowableFilter<T>(Flowable.fromPublisher(onSubscribe), predicate));
          }
  
          public final <R> CylonDetectorObservable<R> boop(Function<? super T, ? extends R> func) {
              return new CylonDetectorObservable<R>(new FlowableMap<T, R>(Flowable.fromPublisher(onSubscribe), func));
          }
  
          public CylonDetectorObservable<String> DESTROY() {
              return boop(new Function<T, String>() {
                  @Override
                  public String apply(T t) {
                      Object cylon = ((Jail) t).cylon;
                      throwOutTheAirlock(cylon);
                      if (t instanceof Jail) {
                          String name = cylon.toString();
                          return "Cylon '" + name + "' has been destroyed";
                      }
                      else {
                          return "Cylon 'anonymous' has been destroyed";
                      }
                  }});
          }
  
          private static void throwOutTheAirlock(Object cylon) {
              // ...
          }
      }
  
      public static class RobotConversionFunc<T, R> implements Function<Publisher<T>, CylonDetectorObservable<R>> {
          private FlowableOperator<? extends R, ? super T> operator;
  
          public RobotConversionFunc(FlowableOperator<? extends R, ? super T> operator) {
              this.operator = operator;
          }
  
          @Override
          public CylonDetectorObservable<R> apply(final Publisher<T> onSubscribe) {
              return CylonDetectorObservable.create(new Publisher<R>() {
                  @Override
                  public void subscribe(Subscriber<? super R> o) {
                      try {
                          Subscriber<? super T> st = operator.apply(o);
                          try {
                              onSubscribe.subscribe(st);
                          } catch (Throwable e) {
                              st.onError(e);
                          }
                      } catch (Throwable e) {
                          o.onError(e);
                      }
  
                  }});
          }
      }
  
      public static class ConvertToCylonDetector<T> implements Function<Publisher<T>, CylonDetectorObservable<T>> {
          @Override
          public CylonDetectorObservable<T> apply(final Publisher<T> onSubscribe) {
              return CylonDetectorObservable.create(onSubscribe);
          }
      }
  
      public static class ConvertToObservable<T> implements Function<Publisher<T>, Flowable<T>> {
          @Override
          public Flowable<T> apply(final Publisher<T> onSubscribe) {
              return Flowable.fromPublisher(onSubscribe);
          }
      }
  
      @Test
      public void testConvertToConcurrentQueue() {
          final AtomicReference<Throwable> thrown = new AtomicReference<Throwable>(null);
          final AtomicBoolean isFinished = new AtomicBoolean(false);
          ConcurrentLinkedQueue<? extends Integer> queue = Flowable.range(0,5)
                  .flatMap(new Function<Integer, Publisher<Integer>>() {
                      @Override
                      public Publisher<Integer> apply(final Integer i) {
                          return Flowable.range(0, 5)
                                  .observeOn(Schedulers.io())
                                  .map(new Function<Integer, Integer>() {
                                      @Override
                                      public Integer apply(Integer k) {
                                          try {
                                              Thread.sleep(System.currentTimeMillis() % 100);
                                          } catch (InterruptedException e) {
                                              e.printStackTrace();
                                          }
                                          return i + k;
                                      }
                                  });
                      }
                  })
                      .to(new Function<Flowable<Integer>, ConcurrentLinkedQueue<Integer>>() {
                          @Override
                          public ConcurrentLinkedQueue<Integer> apply(Flowable<Integer> onSubscribe) {
                              final ConcurrentLinkedQueue<Integer> q = new ConcurrentLinkedQueue<Integer>();
                              onSubscribe.subscribe(new DefaultSubscriber<Integer>() {
                                  @Override
                                  public void onComplete() {
                                      isFinished.set(true);
                                  }
  
                                  @Override
                                  public void onError(Throwable e) {
                                      thrown.set(e);
                                  }
  
                                  @Override
                                  public void onNext(Integer t) {
                                      q.add(t);
                                  }});
                              return q;
                          }
                      });
  
          int x = 0;
          while (!isFinished.get()) {
              Integer i = queue.poll();
              if (i != null) {
                  x++;
                  System.out.println(x + " item: " + i);
              }
          }
          Assert.assertNull(thrown.get());
      }
  }
  